Patents by Inventor Dorothy L. Stewart

Dorothy L. Stewart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for solubilization of low-rank coal using low molecular weight cell-free filtrates derived from cultures of coriolus versicolor
    Patent number: 5084160
    Abstract: A method is provided for isolating a less than 5,000 dalton molecular weight extracellular product from Coriolus versicolor. The extracellular product is useful for biosolubilizing low-rank coals to form water-soluble products.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: January 28, 1992
    Inventors: Dorothy L. Stewart, James K. Fredrickson, James A. Campbell, John W. Pyne, Jr., Roger M. Bean, Bary W. Wilson
  • Method for solubilization of low-rank coal using a cell-free enzymatic system
    Patent number: 4882274
    Abstract: A method is provided for isolating an extracellular product from white rot fungi. The extracellular product is useful for biosolubilizing low-rank coals to form water-soluble products.
    Type: Grant
    Filed: July 6, 1987
    Date of Patent: November 21, 1989
    Assignee: Electric Power Research Institute, Inc.
    Inventors: John Pyne, Jr., Dorothy L. Stewart, James K. Fredrickson, Martin S. Cohen